Circulating Th17, Th22, and Th1 Cells Are Increased in Psoriasis

Overview

Journal J Invest Dermatol

Publisher Elsevier

Specialty Dermatology

Date 2009 Dec 25

PMID 20032993

Citations 225

Authors

Shinji Kagami

Heather L Rizzo

Jennifer J Lee

Yoshinobu Koguchi

Andrew Blauvelt

Affiliations

Soon will be listed here.

Abstract

Th17, Th22, and Th1 cells are detected in psoriatic skin lesions and implicated in psoriasis pathogenesis, but inflammatory T cell numbers in blood, as well as the relative importance of each cell type, is unclear. Using 7-color flow cytometry, circulating Th17, Th22, and Th1 cells were quantified in 21 untreated psoriatics and 17 healthy individuals. CCR6 was the best cell surface marker for IL-17A+ cells when compared with IL-23R or CD161. CCR6+, IL-17A+, IL-22+, CCR6+IL-17A+, CCR6+IL-22+, CCR6+tumor necrosis factor-alpha+, IL-17A+IFN-gamma-, IL-17A+IL-22+IFN-gamma-, and IL-17A+IL-22-IFN-gamma- cells were increased in psoriatics (all values P<0.001), indicating elevations in circulating Th17 cells, using multiple criteria to define these cells. Th22 (IL-17A-IL-22+IFN-gamma-, P<0.05) and Th1 (IL-17A-IFN-gamma+, P<0.05) cells were also increased in psoriatics, but to a lesser extent. Inhibition of either NF-kappaB or STAT3 in vitro blocked cytokine production by both Th17 and Th1 cells. Circulating levels of Th17 and Th1 cells decreased in a subset of five psoriasis patients serially evaluated following induction therapy with infliximab. In summary, elevated numbers of circulating inflammatory T cells may contribute to cutaneous inflammation and systemic inflammatory disease that occurs in individuals with psoriasis.

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